Hammer Map View Toolbar
From Valve Developer Community
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2D Grid
Toggles the 2D grid -- gridlines that show up in the 2D Views. See Show Grid, and Grid Settings for more information.
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3D Grid
Toggles the 3D grid -- gridlines that show up on all brush solids in the 3D View.
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Smaller Grid, Larger Grid
These decrease and increase the grid size. See Show Grid, and Grid Settings for more information.
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Load and Save Window State
These buttons are used to save and restore window configurations when the Use independent window configurations option is being used.

